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18 Utah. Uintah Countv: and Colorado. Moffat County. The Green River from the confluence with the Yampa River in T. 7 N., R. 103 W., section 28 (6th Principal Meridian) to the southern boundary of Dinosaur National Monument in T. 6 N., R. 24 E., section 30 (Salt Lake Meridian). Utah. Ui ntah and Grand Counti es. The Green Ri ver CDeso 1 ati on and Gray Canyons) from Sumners Amphitheater in T. 12 S., R. 18 E.. section 5 (Salt Lake Meridian) to Swasey's Rapid in T. 20 S., R. 16 E., section 3 (Salt Lake Meridian). Utah Grand Countv: and Colorado Mesa Countv. The Colorado River from Black Rocks in T. 10 S., R. 104 W., section 25 (6th Principal Meridian) to Fish Ford in T. 21 S., R. 24 E., section 35 (Salt Lake Meridian). Utah. Garfield and San Juan Counties. The Colorado River from Brown Betty Rapid in T. 30 S., R. 18 E.. section 34 (Salt Lake Meridian) to Imperial Canyon in T. 31 S., R. 17 E.. section 28 (Salt Lake Meridian). Bonvtail The bony tail is the rarest native fish in the Colorado River. Formerly reported as widespread and abundant in mainstem rivers (Jordan and Evermann 1896), its populations have been greatly reduced. The fish is presently represented in the wild by a low number of old adult fish in Lake Mohave and perhaps other lower basin reservoirs (USFWS 1990a). The last known riverine area where bony tail were common was the Green River in Dinosaur National Monument, where Vanicek (1967) and Holden and Stalnaker (1970) collected 91 specimens during 1962 -1966. From 1977 to 1983, no bony tail were collected from the Colorado or Gunnison rivers in Colorado or Utah (Wick et al. 1979, 1981: Valdez et al. 1982b: Miller et al. 1984). However, in 1984, a single bony tail was collected from Black Rocks on the Colorado River (Kaeding et al. 1986). Several suspected bony tail were captured in Cataract Canyon in 1985 - 1987 (Valdez 1985. 1987, 1988). The bony tail is considered a species that is adapted to mainstem rlvers, where it has been observed in pools and eddies (Vanicek 1967: Minckley 1973). Spawning of bony tail has never been observed in a river, but ripe fish were collected in Dinosaur National Monument during late June and early July suggesting that spawning occurred at water temperatures of about 640 F (Vanicek and Kramer 1969).